Ott, Watne R. <br/><br/>
Water quality indices :  a survey of indices used in the United States / 
by Watne R. Ott 
 - Washington, D.C. :  U.S. Environmental Protection Agency,  1978 
 - 128 p. :  ill. ;  28 cm. 
 - Environmental monitoring Series .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water-supply
<br/><br/><label>Dewey Class. No.: </label>333.91